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Radiology, Vol 169, 59-63, Copyright © 1988 by Radiological Society of North America

ARTICLES

Human heart: tagging with MR imaging--a method for noninvasive assessment of myocardial motion

EA Zerhouni, DM Parish, WJ Rogers, A Yang and EP Shapiro
Russell H. Morgan Department of Radiology and Radiolgical Science, Johns Hopkins Medical Institutions, Baltimore, MD 21205.

Specified regions of the myocardium can be labeled in magnetic resonance (MR) imaging to serve as markers during contraction. The technique is based on locally perturbing the magnetization of the myocardium with selective radio-frequency (RF) saturation of multiple, thin tag planes during diastole followed by conventional, orthogonal- plane imaging during systole. The technique was implemented on a 0.38-T imager and tested on phantoms and volunteers. In humans, tags could be seen 60-450 msec after RF saturation, thus permitting sampling of the entire contractile phase of the cardiac cycle. Tagged regions appear as hypointense stripes, and their patterns of displacement reflect intervening cardiac motion. In addition to simple translation and rotation, complex motions such as cardiac twist can be demonstrated. The effects of RF pulse angle, relaxation times, and heart rate on depiction of the tagged region are discussed.


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